A Microscope That Sees Deep Inside Tumors express
Light we can't see but feel as heat turns out to be the key to cellular life. A new type of microscope uses waves 2000–2500 nanometers long, three times longer than red light, and such waves barely scatter in tissue. Thanks to this, the device peers into a tumor spheroid like a flashlight through frosted glass, illuminating individual molecules.
The instrument detects carbon-hydrogen bonds — bonds found in fats, proteins, and sugars. It can see them even 200 micrometers deep inside an intact tumor spheroid (a ball of cells about the size of a grain of sand). And if drug molecules are labeled with deuterium, heavy hydrogen, you can trace how the drug penetrates the skin, like dye traveling through the veins of a leaf.
This ability to see deep without cutting or staining brings us closer to a time when doctors will monitor disease and treatment directly inside a patient's body — not through indirect signs, but through the living chemistry of tissue.
A tumor spheroid is a ball of cancer cells about 0.2 mm in diameter; it's grown in the lab to test drugs without using animals.
In 'Star Trek,' the medical tricorder scans the body and instantly gives a diagnosis: this new microscope is a first step toward such chemical mapping.